雷达扫描动画

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JavaScript

var c = $("#myCanvas")[0];
var ctx = c.getContext("2d");
var color_gold="185,147,98";
var ww,wh;
var center={x: 0,y: 0};

function getWindowSize(){
  ww=$(window).outerWidth();
  wh=$(window).outerHeight();
  c.width=ww;
  c.height=wh;
  center={x: ww/2,y: wh/2};
  
  ctx.restore();
  ctx.translate(center.x,center.y);
}
getWindowSize();

$(window).resize(getWindowSize);

var enemies=Array(10).fill({}).map(
  function(obj){
    return {
      r: Math.random()*200,
      deg: Math.random()*360,
      opacity: 0
    } 
  }
);

setInterval(draw,10);
var time=0;

var deg_to_pi=Math.PI/180;

function Point(r,deg){
  return {
    x: r*Math.cos(deg_to_pi*deg),
    y: r*Math.sin(deg_to_pi*deg),
  };
}

function Color(op){
  return "rgba("+color_gold+","+op+")";
}

function draw(){
  time+=1;
  
  ctx.fillStyle = "#111";
  ctx.beginPath();
  ctx.rect(-2000,-2000,4000,4000);
  ctx.fill();
  
  ctx.strokeStyle="rgba(255,255,255,0.1)";
  ctx.moveTo(-ww/2,0);
  ctx.lineTo(ww/2,0);
  ctx.moveTo(0,-wh/2);
  ctx.lineTo(0,wh/2);
  ctx.stroke();
  
  ctx.strokeStyle=Color(1);
  var r=200;
  var deg=time;
  var newpoint=Point(r,deg);
  var line_deg = (time/2) % 360;
  // console.log(line_deg);
  
  var line_deg_len=100;
  
  for(var i=0;i<line_deg_len;i++){
    // var deg = (time-i);
    var deg1 = (line_deg-i-1) ;
    var deg2 = (line_deg-i) ;
    
    var point1=Point(r,deg1);
    var point2=Point(r,deg2);
    var opacity=1-(i/line_deg_len)-0.3;
    if (i==0) opacity=1;
    ctx.beginPath();
    // ctx.fillStyle="white";
    ctx.fillStyle=Color(opacity);
    ctx.moveTo(0,0);
    ctx.lineTo(point1.x,point1.y);
    ctx.lineTo(point2.x,point2.y);
    // ctx.stroke();
    ctx.fill();
  }
  
  enemies.forEach(function(obj){
    ctx.fillStyle=Color(obj.opacity);
    var obj_point=Point(obj.r,obj.deg);
    
    ctx.beginPath();
    ctx.arc(
      obj_point.x,obj_point.y,
      4,0,2*Math.PI
    );
    ctx.fill();
    
    ctx.strokeStyle= Color(obj.opacity);
    var x_size=6;
    ctx.lineWidth=4;
    ctx.beginPath();
    ctx.moveTo(obj_point.x-x_size,obj_point.y+x_size);
    ctx.lineTo(obj_point.x+x_size,obj_point.y-x_size);
    ctx.moveTo(obj_point.x+x_size,obj_point.y+x_size);
    ctx.lineTo(obj_point.x-x_size,obj_point.y-x_size);
    ctx.stroke();
    
    if (Math.abs(obj.deg - line_deg)<=1){
      obj.opacity=1;
      $(".message").text("Detected: "+ obj.r.toFixed(3) + " at " +obj.deg.toFixed(3));
    }
    obj.opacity*=0.99;
    
    ctx.strokeStyle= Color(obj.opacity);
    ctx.lineWidth=1;
    ctx.beginPath();
    ctx.arc(
      obj_point.x,obj_point.y,
      10*(1/(obj.opacity+0.0001)),0,2*Math.PI
    );
    ctx.stroke();
    
    
  });
  
  ctx.strokeStyle=Color(1);
  var split =120;
  var feature =15;
  var start_r=230;
  var len = 5;
  
  for(var i=0;i<split;i++){
    ctx.beginPath();
    var deg = (i/120) * 360;
    
    if (i%feature==0){
      len=10;
      ctx.lineWidth=3;
    }else{
      len=5; 
      ctx.lineWidth=1;
    }
    
    
    var point1 =Point(start_r,deg);
    var point2 =Point(start_r+len,deg);
    
    ctx.moveTo(point1.x,point1.y);
    ctx.lineTo(point2.x,point2.y);
    
    ctx.stroke();
    
  }
  
  function CondCircle(r,lineWidth,func_cond){
    
    ctx.lineWidth=lineWidth;
    ctx.strokeStyle=Color(1);
    
    ctx.beginPath();
    for(var i=0;i<=360;i++){
      var point =Point(r,i);
      if (func_cond(i)){
        ctx.lineTo(point.x,point.y);
      }else{
        ctx.moveTo(point.x,point.y);
      }
    }
    ctx.stroke();
   
  }
  // CondCircle(300);
  
  CondCircle(300,2,function(deg){
    return ((deg+time/10)%180)<90;
  });
  CondCircle(100,1,function(deg){
    return (deg%3)<1;
  });
  CondCircle(190,1,function(deg){
    return true;
  });
  
  
}

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